This section is from the book "The Building Trades Pocketbook", by International Correspondence Schools. Also available from Amazon: Building Trades Pocketbook: a Handy Manual of reference on Building Construction.

The decimal fractions printed in large type give the exact value of the corresponding fraction to the fourth decimal place. A given decimal fraction is rarely exactly equal to any of these values, and the numbers in small type show which common fraction is nearest to the given decimal. Thus, lay off the fraction .1330 in 64ths. The nearest decimal fractions are .1250 and .1406. The value of any fraction in small type is the mean of the two adjacent fractions. In this instance the mean fraction is .1328, and as .1330 is greater than this, .1406 or 9/64 will be chosen. In the same manner the nearest friths corresponding to the decimal fractions .3670 and .8979 are found to be 23/64 and 57/64, respectively.

Fraction | Decimal | Fraction | Decimal | Fraction | Decimal | Fraction | Decimal |

.0078 | .2578 | .5078 | .7578 | ||||

1/64 | .0156 | 17/64 | .2656 | 33/64 | .5156 | 49/64 | .7656 |

.0235 | .2735 | .5235 | .7735 | ||||

1/32 | .0313 | 9/32 | .2813 | 17/32 | .5313 | 25/32 | .7813 |

.0391 | .2891 | .5391 | .7891 | ||||

3/64 | .0469 | 19/64 | .2969 | 35/64 | .5469 | 51/64 | .7969 |

.0547 | .3047 | .5547 | .8047 | ||||

1/16 | .0625 | 5/16 | .3125 | 9/16 | .5625 | 13/16 | .8125 |

.0703 | .3203 | .5703 | .8203 | ||||

5/64 | .0781 | 21/64 | .3281 | 37/64 | .5781 | 53/64 | .8281 |

.0860 | .3360 | .5860 | .8360 | ||||

3/32 | .0938 | 11/32 | .3438 | 19/32 | .5938 | 27/32 | .8438 |

.1016 | .3516 | .6016 | .8516 | ||||

7/64 | .1094 | 23/64 | .3594 | 39/64 | .6094 | 55/64 | .8594 |

.1172 | .3672 | 6172 | .8672 | ||||

1/8 | .1250 | 3/8 | .3750 | 5/8 | .6250 | 7/8 | .8750 |

.1328 | .3828 | .6328 | .8828 | ||||

9/64 | .1406 | 25/64 | .3906 | 41/64 | .6406 | 57/64 | .8906 |

.1485 | .3985 | .6485 | .8985 | ||||

5/32 | .1563 | 13/32 | .4063 | 21/32 | .6563 | 29/32 | .9063 |

.1641 | 4141 | .6641 | .9141 | ||||

11/64 | .1719 | 27/64 | .4219 | 43/64 | .6719 | 59/64 | .9219 |

.1797 | .4297 | .6797 | .9297 | ||||

3/16 | .1875 | 7/16 | .4375 | 11/16 | .6875 | 15/16 | .9375 |

.1953 | .4453 | .6953 | .9453 | ||||

13/64 | .2031 | 29/64 | .4531 | 45/64 | .7031 | 61/64 | .9531 |

.2110 | .4610 | .7110 | .9610 | ||||

7/32 | .2188 | 15/32 | .4688 | 23/32 | .7188 | 31/32 | .9688 |

.2266 | .4766 | .7266 | .9766 | ||||

15/64 | .2344 | 31/64 | .4844 | 47/64 | .7344 | 63/64 | .9844 |

.2422 | .4922 | .7422 | .9922 | ||||

1/4 | .2500 | 1/2 | .5000 | 3/4 | .7500 | l | 1.0000 |

.2578 | .5078 | .1578 | 1.0078 |

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